Cheeky show host Fallon presented the Lucy actor with a red balloon full of helium gas and gently persuaded the Oscar winner to partake in his little experiment, reenacting a prior helium moment from Freeman’s science documentary series Through the Wormhole.

"I do love your voice and everyone loves your voice," Fallon explained, "but I was wondering what your voice would sound like on helium. I'll do the same interview, I'll just do it on helium," he added, laughing.